Hey everyone, I just wanted to share this link to an article on how to create your own folding game board:
https://boardgamegeek.com/thread/531148/folding-board-tutorial-pictures
The 14-ply chipboard the OP recommends is only $0.66 per 22x28 sheet (when I bought 25 sheets). I also recommend the tape he suggests. I didn't use full size label sheets, though, I just printed 11x17 color sheets and used spray adhesive and it worked great (the Elmer's spray adhesive I got from Michael's didn't bleed through or warp the paper or chipboard at all).
Making my first one took me about 2.5 hours to make a 4-sided folding board, but after the forts it will probably take 1.5 hours.
Attached are pictures of how my prototype turned out. I highly recommend doing this for prototypes. I am sending prototypes to friends and playtesters, and will make one of these for each playtesting prototype.
